121421605144 has 16 divisors (see below), whose sum is σ = 260189154000. Its totient is φ = 52037830752.

The previous prime is 121421605133. The next prime is 121421605213. The reversal of 121421605144 is 441506124121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1084121419 + ... + 1084121530.

It is an arithmetic number, because the mean of its divisors is an integer number (16261822125).

Almost surely, 2^121421605144 is an apocalyptic number.

121421605144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121421605144 is an abundant number, since it is smaller than the sum of its proper divisors (138767548856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121421605144 is a wasteful number, since it uses less digits than its factorization.

121421605144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168242962 (or 2168242958 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 121421605144 its reverse (441506124121), we get a palindrome (562927729265).

The spelling of 121421605144 in words is "one hundred twenty-one billion, four hundred twenty-one million, six hundred five thousand, one hundred forty-four".